Drive and drum support for concrete mixers



Nov. 8, 1927. 1,648,063

A. w. RYBECK DRIVE AND DRUM SUPPORT FOR CONCRETE MIXERS Filed July 24, 1925 Patented Nov. 3, i927.

llhllTED STATES PATENT 1 OFFICE.

enonrn w. nYBncK, or MILWAUKEE, WISCONSIN, Assrenon in THE r. L. sMrrI-r COMPANY, or MILWAUKEE, WISCONSIN, A oonronerrouor Wisconsin.

DRIVE, AND nmiM sorronr FOR ooncnnrn Mrxnns,

, Application filed July 24, 1925. Serial No; 45,783.

This invention relates to a new and improved drive and drum support for concrete mixers and more particularly, to such a construction in which the tilting and, driving mechanism may be so related that the mixing drum may be located with its center of support substantially in the plane of the tilting axis.

This invention is in the nature of an improvement or modification of my construction shownin my prior pending application, Serial No. 632,301, filed April 16, 1923. In the construction of the prior application, the drum was driven by a bevel gear on the drum directly driven by a bevel gear on the drive and tilting shaft. This construction involved the location of the supporting rollers eccentrically of the tilting axis and this eccentric load affected the tilting.

In the present construction, the drum is driven by a spur gear in driving connection with the tilting and drive shaft through an intermediate shaft, and both the guide and supporting rollers are located substantally in Y the plane of the tilting axis.

It is an object of the present invention to provide a mixer construction in which the mixing drum is supported substantially in the plane of the tilting axis.

It is a further object toprovide a construction of this character in which the drum is guided by a single series of guide rollers working in a circumferential channel in a member secured to the mixing drum.

It is also an object to produce a construction which is simple in design, composed of but few parts and adapted for commercial production.

Other and further objects will appear as the description proceeds.

T have illustrated a preferred embodiment ofmy invention in the accompanying drawings, in which I Figure 1 is a side elevation of a mixer constructed according to the present invention; T

Figure 2 is a fragmentary section on an enlarged scale taken on line 22 of F igure 1; I

Figure 3 is a fragmentary section on an enlarged scale taken on line 3-3 of Figure 1; I

Figure l is a fragmentary section on an enlarged scale taken on line 4-4 of Figure 1; and r c Figure 5 is a fragmentary sect-ion on an enlarged scale taken on line 5-5 of F ig-' ure 1.

The mixer is shown as supported upon the frame 11 carried upon wheels 12 andl3. The mixing drum 14 is supported from the frame members 15 and 16 bythe cradle 17.

The supporting rollers 18 are carried in bifurcated portions of the cradle 17 upon the axles 19 as shown in detail in Figure 4. The ClllVBtLIlLl bearing ring 20 is secured to the drum lt by rivets 21. This ring 20 is provided with the circumferential recess 22 upon the bottomof whichthe supporting rollers 18 bear, as clearly shown in Figure 4. The ring 20 is also provided with the lateral spur gear 23, which extends around the circumference of the drum.

The drum is guided and held against lateral displacement bythelower guide roller and the upper guide rollers 25 shown in F gures 7 5 and 3 "respectively. A roller 24 is carried upon stub shaft 26 which The guide extends radially" inward from the-cradle 17 and the rollers 25 are supportedupon similar shafts 27. i

The upper left end of the cradle 17 is provided with the gear housing 28 shown in section in Figure 2. An extension 28 of the housing 28 surrounds the drive shaft 34. This extension is supported in the frame member 16 and transmits the cradle and drum load to the supporting frame. This gear housing 28 carries the intermediate shaft 29 upon which is rotatably fittedthe intermediate gear member 30. This member 30 is provided at one end with the spur gear 31, which meshes with the spur gear 23 carried upon the mixer drive ring 20. The other end of the member 30 is provided with the beveled gear 32 which meshes with the beveled gear 33, the latter being keyed to the end of the drive shaft 34.} The drive shaft 34: carries no load as the cradle is sup ported on the extension 28 but the cradle is carrying upon its outer end a gear 35 which v axis of the shaft 345 about which aXisthe mixer is tilted. The Weight ofthe. drum is, therefore, not transmitted eccentrically to the cradle and the tilting of the cradle and assembly facilitated. The axes of the guide rollersiflet and25 are also substantially in the plane of the tilting axis which causes the lateral thrusts also to be transmit ted to thecradle substantially in the plane of the tilting. axis and supporting rollers.

The present construction retains the advantages of my prior construction disclosed in the application above referred to, in that the drum is guided by a single set of guide rollers and. has in addition the advantage of the location. of the supporting rollers .in the p porting rollers carried. by the cradle and litplane oflthev tilting axis. I

Ihave. shownv one preferred form, of construction by way of illustration, but it is to he understood that I contemplate .such changes and modifications as come Within the spiritfandi scope of the accompanying claims.

I claim: 7

1. In a mixing machine, a mixing drum, a member encircling the drum having a circumferential recess therein, a cradle, rollers engaging in the recess and carried by the cradle, and. members tiltably. supporting the cradle, said members being located in the plane of the recess.

2. In a mixing machine, a mixing drum, a member encircling the drum having a circumferential recess therein, a cradle, supporting rollerscarried by. the. cradleand engaging thebase. of. the recess, members tiltably supporting the cradle, the tilting axis being-locateclsubstantially in the plane of the supporting rollers.

3'. In a mixing machine, a mixing drum, a member encircling the drum having a circumferential recess therein, a spur gear located laterally of" the recess, a cradle, supporting rollers carried by the cradle and litting inthe recess, a cradle supporting member and. a drive shaft located in the plane of said recess, and an intermediate shaft connected by gears to the drive shaft and drum. spur gear.

4.. In. a mixing machine, a mixing drum, a member encircling, the drum having a circumferential recess therein, a spur gear located laterally of the recess, a cradle, supting in the recess, a cradle supporting memher and a drive shaft located in the plane of said recess, an intermediate shaft carried by the cradle, a gear on the intermediate shaft on one side of the plane of the recess engaging a gear on the drive shaft, and a spur gear. on the intermediate shaft on the other. side of: the plane of the recess engaging the CliTLmLSPIll gear.

Signed at Milwaukee, lVisconsin, this 20th day of' July, 1925.

. ADOIJPH' W. RYB'EGK. 

